Electromotive force (emf)

[Matthew Tsai 2H]

Can someone explain what emf is exactly and if we need to know anything about it other than that it represents max work?

[Dina 2k]

the book mentions that EMF is the same as the cell potential of a cell.

[Sanjana Borle 2K]

I think all we need to know is that EMF is the same thing as the cell potential, or the variable E, so if a problem refers to emf it is just referring to E.

[EvanWang]

And also, maximum nonexpansion work is the same as Gibbs free energy, so emf directly relates to

[Jocelyn Thorp 1A]

it's the voltage of the cell

[Miriam Villarreal 1J]

Emf is given a positive value if the cell reaction is spontaneous. This implies that the electrode on the left forces electrons into the external circuit and the electrode on the right withdraws them

On the other hand, Emf is given a negative value if the cell reaction is nonspontaneous. This implies that if the half-cell on the right side of the shorthand cell notation is releasing electrons, making the right-hand terminal of the voltmeter negative

[Sreyes_1C]

if its the same as cell potential I would assume we don't need to know much more about it

[005384106]

How do you calculate for EMF?

[005384106]

Why do we measure the voltage difference of two cells?

[Julia Holsinger_1A]

Why do we measure the voltage difference of two cells?

The difference in potential voltage is what gives rise to electric current